ashcroft



a Sheets-Sheet 1.

J. ASHCROFT.

GLASS FURNAG P ted Oct. 13, 1885.

3 Sheets-Sheet 2.

(No Model.) a J. ASHCROFT.

GLASS FURNACE.

No. 327,984. Patented Oct. 13, 1885.

p r-W 1 t W Q IIVVENTOI? WITNESSES (No Model.) s Sheets-Sheet s. J.ASHCROFT.

GLASS FURNACE.

' PatentedOot. 13, 18.85.

IIVVEIVTOI? By A Attorney WITNESSES UNITED STATES PATENT OFFICE.

JOHN ASHCROFT, OF NEW'YORK, N. Y.

G LASS-FU RN'ACE.

SPECIFICATION forming part of Letters Patent No. 327,984, dated October13, 1885.

A pplication filed February 9, 1885. Serial No. 155,292. (No model.)

To all whom it may concern:

Be it known that I, J OHN ASHCROFT, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Glass-Furnaces, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

My invention relates to improvements in furnaces for melting andannealing glass, and for other purposes in which natural or other gas isused as a heating medium.

The object of my invention is to construct the floor, roof, or sides ofthe furnace with perforated tiles, whereby the gas and air aredistributed uniformly and in the proper proportions over the entiresurface of the furnace, thus producing a more intense and uniform heatin the furnace than has heretofore been attained; and to this end myinvention consists in making the floor, roof, or sides of the furnace ofhollow tile, having a single chamber in which the gas and air are mixed,and provided with numerous apertures in the side which open into thecombustion-chamber.

My invention consists, further, in providing the apertures of the tilewith ferrules adapted to be removed from the apertures when worn out orclogged up.

My invention consists in certain other details of construction, whichwill be described hereinafter, and pointed out in the claims.

Figure 1 is a sectional view of a glass-melt ing furnace with myimprovement therein.

Fig. 2 is a sectional view showing my invention as applied to aboiler-furnace. Fig. 3 is an end view of the boiler-furnace. Fig. 4: is

a top or plan view of a glass-melting furnace with pots in position.Fig. 5 is a side view of the airregulating slide. Fig. 6 is a detachedsectional view of the tile, showing the ferrule in the perforation.

A indicates the combustion-chamber of a glass-melting furnace, in whichare arranged the usual pots, B. The floor of the combustion-chamber isprovided with any desired number of tiles C, said tiles being providedwith a chamber, D, and perforations E. The tiles 0 are by preferencemade of heavy castiron of the form shown; but may be made of fire-clayor any suitable material of any form best adapted for the purpose. Theinner end of the tile is closed, while the outer end is provided with acontracted opening or pipe, 0, which communicates with the external air,and is adapted to be closed by a perforated sliding bar, F.

As before indicated, the tile 0 is provided with numerous perforations Ethrough the upper surface, which slightly taper from the exterior of thetile toward the chamber D, into which are driven the ferrules or tipsGr, said ferrules or tips being provided with small apertures a, throughwhich the gas and air are admitted to the combustion-chamber.

The ferrules or tips, as before stated, are driven into the apertures Gand can be readily removed when worn or burned out, or when clogged orchoked up can be readily cleaned out by a suitable tool.

H is a gas'supply pipe, provided with a suitable valve or cook, I,through which natural or other gas is admitted to the chamber D, thequantity admitted being governed or regulated by the valve I.

F is a slide, provided with suitable perforations, K, which registerwith the open ends of the tile 0, and by which means the requi siteamount of air for the complete combus tion of the gas is admitted to thechamber D, where it is mingled with gas and passes into the combustionchamber through the apertures a.

In Fig. 2 A indicates the combustion-chain ber of an ordinaryboiler-furnace, the other parts being the same as those alreadydescribed in relation to Fig. 1.

The operation of my device is as follows: The gas having been turned onand the slide adj usted to admit the requisite amount of air, the air isdrawn in by the force of the gas-jet and mingled with the gas in thechamber D, from whence it enters the combustion-chamber and is consumed.

Having thus described my invention,what I claim, and desire to secureby, Letters Patent, 1s-

1. In furnaces for melting glass. and for other purposes, a tile havingan air and gas mixing chamber, the top of which is provided withnumerous perforations to admit the mixed air and gas to thecombustion-chamber.

2. In furnaces for melting glass and other materials, an air and gasmixing chamber, the

top of which is provided with numerous perforations, in which are placedthe removable ferrules or tips a, as set forth.

3. In furnaces for burning natural or other JOHN ASHCROFT. 5 gas, thegas-mixing chamber D, having perforations, as described, for admittingnumerous WVitnesses: jets of gas and air into the eombustion-eham-ARTHUR O. FRIsBIE, her, in combination with the gas-pipe H and SAMUEL P.BELL. perforated slide F, as set forth. I

In testimony whereof Iaffix my signature in 10 presence of twowitnesses.

